Cause Analysis of a Mixed Severe Convective Weather Process in Yueyang in 2021
Using conventional meteorological data,NCEP 6-h and 3-h reanalysis data(spatial resolution of 1°×1°)and radar data,the evolution and characteristics of a mixed severe convective weather process in Yueyang City,Hunan Province on 15 May 2021 are analyzed,and a brief analysis of different locations for the extreme wind speed and the heavy rainfall center is carried out.The results show that,under the circulation situation of two troughs and one ridge,the southern branch trough,the low vortex,the shear line,and the cold air infiltration into the ground inverted trough are the synoptic-scale influence systems;the strong transportation and convergence of water vapor,the"upper dry and cold,lower warm and wet"unstable stratification,and strong vertical wind shear are the favorable environmental conditions for this strong convective weather.The morphological characteristics of radar echo,such as three body scattering,mesocyclone,V-notch,mid-level radial convergence(MARC),VIL jump,and train effect are of great significance for the analysis and identification of different types of severe convective weather as well as for the release of severe convective weather warning.The fact that the extreme wind speed and the heavy rainfall center occur at different positions is related to the central position of water vapor convergency,the vertical motion intensity and the difference in the unstable energy conditions.It is also connected to the blocking effect of Dongting Lake,the large water body,and the eastern mountainous areas of Linxiang.
severe convectioncirculation situationenvironmental conditionsradar echo characteristics
万方数据
维普
